Formation Behavior of Intermetallic Layer on Die Material in Casting Al-Si Alloy with the Variation of Fe Content

Abstract:

This study aims to investigate the formation behavior of intermetallic phases on casting mold die and its effect on erosion tendency in molten Al-Si alloy with the variation of Fe content. For these purposes, dipping tests of die material into molten Al-Si alloys with 0.98 and 1.33wt%Fe were carried out as a function of dipping time. Three kinds of intermetallic phases, α-AlFeSi, β-AlFeSi and θ-AlFe, were found to form on the interface between die and molten alloy in sequence, as iron and aluminum solutes diffuse into the molten alloy and die steel, respectively. It was discussed that the erosion process was decelerated in the case of the high-iron containing alloy, because of the decreased gradient of iron solute through the interface and enhanced diffusion barrier of intermetallic layer.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 1735-1739
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.1735
• Online since: November 2011
• Authors: Bong Hwan Kim, Sangh Wan Lee, Sang Mok Lee
• Keywords: Al-Si Alloy, Casting, Die Erosion, Die Soldering, Diffusion, Intermetallic

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DOI: 10.1016/j.surfcoat.2008.01.019